We introduce the AdditiveToricVarieties package for Macaulay2, a software system for algebraic geometry and commutative algebra, with methods for working with additive group actions on complete toric varieties. More precisely, we implement algorithms, based on results by Arzhantsev, Dzhunusov and Romaskevich, to determine whether a complete toric variety admits an action of the commutative unipotent group and whether it is unique or not. We also observe that every smooth complete toric variety of Picard rank two is additive. We apply our methods to the class of smooth Fano toric varieties and notably determine all such varieties of dimension up to 6 admitting an additive action.